// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CONTENT_BROWSER_SPEECH_AUDIO_ENCODER_H_
#define CONTENT_BROWSER_SPEECH_AUDIO_ENCODER_H_

#include <string>

#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "content/browser/speech/audio_buffer.h"
#include "third_party/flac/include/FLAC/stream_encoder.h"

namespace content {
class AudioChunk;

// Provides a simple interface to encode raw audio using FLAC codec.
class AudioEncoder {
public:
    AudioEncoder(int sampling_rate, int bits_per_sample);
    ~AudioEncoder();

    // Encodes |raw audio| to the internal buffer. Use
    // |GetEncodedDataAndClear| to read the result after this call or when
    // audio capture completes.
    void Encode(const AudioChunk& raw_audio);

    // Finish encoding and flush any pending encoded bits out.
    void Flush();

    // Merges, retrieves and clears all the accumulated encoded audio chunks.
    scoped_refptr<AudioChunk> GetEncodedDataAndClear();

    std::string GetMimeType();
    int GetBitsPerSample();

private:
    AudioBuffer encoded_audio_buffer_;

    FLAC__StreamEncoder* encoder_;
    bool is_encoder_initialized_;

    DISALLOW_COPY_AND_ASSIGN(AudioEncoder);
};

} // namespace content

#endif // CONTENT_BROWSER_SPEECH_AUDIO_ENCODER_H_
